123 lines
3.3 KiB
Python
123 lines
3.3 KiB
Python
"""Core Warlock functionality"""
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import copy
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import jsonschema
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class InvalidOperation(RuntimeError):
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pass
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class ValidationError(ValueError):
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pass
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def model_factory(schema):
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"""Generate a model class based on the provided JSON Schema
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:param schema: dict representing valid JSON schema
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"""
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schema = copy.deepcopy(schema)
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def validator(obj):
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"""Apply a JSON schema to an object"""
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try:
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jsonschema.validate(obj, schema)
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except jsonschema.ValidationError as exc:
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raise ValidationError(str(exc))
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class Model(dict):
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"""Self-validating model for arbitrary objects"""
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def __init__(self, *args, **kwargs):
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d = dict(*args, **kwargs)
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# we overload setattr so set this manually
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self.__dict__['validator'] = validator
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try:
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self.validator(d)
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except ValidationError as exc:
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raise ValueError(str(exc))
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else:
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dict.__init__(self, d)
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self.__dict__['changes'] = {}
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def __getattr__(self, key):
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try:
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return self.__getitem__(key)
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except KeyError:
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raise AttributeError(key)
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def __setitem__(self, key, value):
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mutation = dict(self.items())
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mutation[key] = value
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try:
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self.validator(mutation)
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except ValidationError:
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msg = "Unable to set '%s' to '%s'" % (key, value)
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raise InvalidOperation(msg)
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dict.__setitem__(self, key, value)
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self.__dict__['changes'][key] = value
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def __setattr__(self, key, value):
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self.__setitem__(key, value)
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def clear(self):
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raise InvalidOperation()
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def pop(self, key, default=None):
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raise InvalidOperation()
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def popitem(self):
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raise InvalidOperation()
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def __delitem__(self, key):
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mutation = dict(self.items())
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del mutation[key]
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try:
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self.validator(mutation)
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except ValidationError:
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msg = "Unable to delete attribute '%s'" % (key)
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raise InvalidOperation(msg)
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dict.__delitem__(self, key)
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def __delattr__(self, key):
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self.__delitem__(key)
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# NOTE(termie): This is kind of the opposite of what copy usually does
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def copy(self):
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return copy.deepcopy(dict(self))
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def update(self, other):
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mutation = dict(self.items())
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mutation.update(other)
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try:
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self.validator(mutation)
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except ValidationError as exc:
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raise InvalidOperation(str(exc))
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dict.update(self, other)
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def iteritems(self):
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return copy.deepcopy(dict(self)).iteritems()
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def items(self):
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return copy.deepcopy(dict(self)).items()
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def itervalues(self):
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return copy.deepcopy(dict(self)).itervalues()
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def values(self):
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return copy.deepcopy(dict(self)).values()
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@property
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def changes(self):
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return copy.deepcopy(self.__dict__['changes'])
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Model.__name__ = str(schema['name'])
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return Model
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